I think that this strip is one of the best summaries of the character of Faye, as she is now, that we've seen in a while. She is still very assertive and isn't brilliant with boundaries (I think that the consistent point Jeph has made in the strip for years is that no-one is that good with those in the end). However, in the end, she wants to help her friends. Notice that her first concern is to make sure it is in good condition. Why? Because, yes, he is a friend, as poor as both characters in this strip are in general at showing those feelings sometimes.
Also, no, Pintsize doesn't qualify for a discount. Not only can Faye probably not afford it, I suspect that he doesn't have money problems.
Oddly enough, this strip has the feeling to me as a weird sort of metaphor of what it must be like to have a friend who is a doctor: You sometimes get unplanned physicals and unsolicited diagnoses!